Alkaline battery

Abstract

An alkaline battery includes a cathode mix containing a compound oxide of silver, cobalt, and nickel represented by Ag x Co y Ni z O 2 wherein x+y+z=2, x≦1.10, y>0.

1 . An alkaline battery comprising:
 a cathode mix containing a compound oxide of silver, cobalt, and nickel represented by formula (1):
   Ag x Co y Ni z O 2   (1) 
   wherein x+y+z=2, x≦1.10, y>0.   
   
   
       2 . The alkaline battery according to  claim 1 , further comprising:
 a cathode can in which the cathode mix is disposed, the cathode can having an open end; and   an anode cup that seals the open end of the cathode can,   wherein the alkaline battery is of a button type.   
   
   
       3 . The alkaline battery according to  claim 2 , wherein the compound oxide of silver, cobalt, and nickel represented by formula (1) satisfies y≧0.01. 
   
   
       4 . The alkaline battery according to  claim 2 , wherein the cathode mix further contains at least one of silver oxide and manganese dioxide. 
   
   
       5 . The alkaline battery according to  claim 2 , wherein the cathode mix further contains manganese dioxide. 
   
   
       6 . The alkaline battery according to  claim 2 , wherein the cathode mix contains 1.5 to 60 percent by weight of the compound oxide of silver, cobalt, and nickel. 
   
   
       7 . The alkaline battery according to  claim 2 , further comprising an anode mix containing a zinc or zinc alloy powder that is mercury-free, the anode mix being disposed in the anode cup. 
   
   
       8 . The alkaline battery according to  claim 7 , wherein an open end of the anode cup is folded to have a U-shaped cross-section to form a turnup portion, and
 a coating layer composed of a metal having a hydrogen overvoltage higher than that of copper is disposed on a region of an inner surface of the anode cup excluding a bottom and an outer turnup portion of the turnup portion of the anode cup.   
   
   
       9 . The alkaline battery according to  claim 8 , wherein the coating layer is composed of tin.